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Got my new sirio vector 4000 today
- Thread starter radioman24
- Start date
nice .what are ya gonna be comparing it too? what kinda land you have around you?
flat,hilly, on a hill, down in a valley .
Has H&Y and Coppers lost their exclusive distribution of Sirio products in the US?
I bought my Vector 4000 from DNJ.
Here's a Sirio web page from Silicon Valley with a DNJ link.
Sirio Antenna, High Performance Antenna Made in Italy
Don't know if they're an authorized Sirio dealer yet
inital setup =use the chart they give ya for lenth
after completely setup= slight changes on gamma lenth maybe needed
24, I believe what hotrod suggest to you is possible the best way to go on Sirio's New Vector 4000.
If this one is like the two Sirio antennas I have, where both are dead nuts on the mark, as far as the instructions are concerned, you have little to worry about. In other words, get that bugger setup just like Sirio instructs, mount it into the clear at a reasonable height, and it is almost like plug and play.
As a note and IMO, the GM does not like it when mounted below about 20' feet or within reason close to anything conductive like another antenna. I think the coil choke at the base is what causes the notion.
These two kits I have come setup as fixed, in other words the don't for the most part even require any measurements. I have a Sirio New Top One and that comes with a gamma match and it is totally fixed as to the design of the kit. My new Gain Master is virtually the same, just a couple of measurements. Put the GM together like Sirio says, and it produces all the characteristics just what they tell us, a good bandwidth just like they say it should be and resonance right on spot.
If you are really careful and really read the instructions as you check each part of the antenna, I don't think you can fail even the first time in the air...it should be exactly right, assuming you have it high enough and pretty well into the clear.
When I put my New Top One up I installed it right were I was intending to use it...and the first time the match was as good as I could expect and it work very well.
I did check my Gain Master about 9' - 11' feet above the ground, and I wasn't impressed at all, but I raised it up anyway and it was near perfect at about 50' feet on my VA1 analyzer and my SWR meter at the end of my 75' feed line. Here are my first readings ever on the Gain Master at 50' to the base and my New Top One a month or two later. Check out the control at about 27.0 to 27.505 using my SWR meter, the data at the bottom of these reports. Sirio is in Italy where CB center is above the center in the US at about 27.500 mhz. I never saw this happen before except when installing my old Stardusters which as fixed kits all the way. Even the hump noted by the analyzer in noted in the specs on Sirio's Website, if you check for the Gain Master, and maybe the New Top one two.
I have never seen a need to try and tune either. Maybe the New Vector is the same. Maybe this will give you a little reassurance that you'll not have to worry.
View attachment Gain Master and New Top One.pdf
Good luck, you get the NV4K setup right, and it will be hard to bet.
As others have said, I suspect you need tp put it together as instructed, then if your SWR at its lowest point is too low, move the gamma rod in a little, if your SWR at its lowest point is too high, move the gamma rod out a little.
I have not purchased one, but built a couple, however, the measurements from the Sirio model were a good starting point.
I have not purchased one, but built a couple, however, the measurements from the Sirio model were a good starting point.
Hey 24, why don't you try using the dimensions given for 27.5 just to see if those dimension will get you close. From there it should be easy to follow Homer's suggestions on moving the gamma...if you're not happy with the antenna set at 27.5 mhz and wanting to work at 27.405.
At the very least if it works out...you'll only be 10 KHZ away from where you want to be. That ain't bad in my book, and for sure if you're just using an SWR meter and a long feed line to test for your tune.
Get that bugger up and start talking big time.